A world map renders each country as an SVG path using `d3.geoPath` and a Natural Earth projection, with data from the world-atlas TopoJSON source. A `d3.zoom` behavior on the SVG element applies pan and zoom transforms to a grouped layer, letting users scale and move the entire map. Hovering over a country triggers a CSS `:hover` rule that changes its fill to red, while a `<title>` element inside each path provides a native tooltip with the country name.